81141615240 has 128 divisors (see below), whose sum is σ = 278285829120. Its totient is φ = 18540921600.

The previous prime is 81141615223. The next prime is 81141615241. The reversal of 81141615240 is 4251614118.

It is not an unprimeable number, because it can be changed into a prime (81141615241) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3087355 + ... + 3113525.

It is an arithmetic number, because the mean of its divisors is an integer number (2174108040).

Almost surely, 2^81141615240 is an apocalyptic number.

It is an amenable number.

81141615240 is an abundant number, since it is smaller than the sum of its proper divisors (197144213880).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81141615240 is a wasteful number, since it uses less digits than its factorization.

81141615240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29883 (or 29879 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 33.

The spelling of 81141615240 in words is "eighty-one billion, one hundred forty-one million, six hundred fifteen thousand, two hundred forty".